Dtk&reg; New High Performance Laptop Battery Replacement For DELL INSPIRON 14 3421 / 14R 5421 / 14R-(3437 N3421 N5421) 15 3521 / 15R-(3537 5537 N3521 N5521 N5537) / 17 3721 / 17R-(5737 N3721 N3737 N5721 N5737) 17R 5721 / 15R 5521 / Latitude 14 3000 /15 3000 / 3440 / 3540 / E3440 / E3540 /VOSTRO 2421 2521 SERIES/ MR90Y ( 11.1V 5200MAH 6CELLS 6-CELLS )